1/**
2 * Copyright (c) 2021-2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#include "hoisting.h"
17
18#include "ir/base/scriptFunction.h"
19#include "varbinder/scope.h"
20#include "compiler/core/pandagen.h"
21
22namespace ark::es2panda::compiler {
23static void HoistVar(PandaGen *pg, varbinder::Variable *var, const varbinder::VarDecl *decl)
24{
25    auto *scope = pg->Scope();
26
27    if (scope->IsGlobalScope()) {
28        pg->LoadConst(decl->Node(), Constant::JS_UNDEFINED);
29        pg->StoreGlobalVar(decl->Node(), decl->Name());
30        return;
31    }
32
33    varbinder::ConstScopeFindResult result(decl->Name(), scope, 0, var);
34
35    pg->LoadConst(decl->Node(), Constant::JS_UNDEFINED);
36    pg->StoreAccToLexEnv(decl->Node(), result, true);
37}
38
39static void HoistFunction(PandaGen *pg, varbinder::Variable *var, const varbinder::FunctionDecl *decl)
40{
41    const ir::ScriptFunction *scriptFunction = decl->Node()->AsScriptFunction();
42    auto *scope = pg->Scope();
43
44    const auto &internalName = scriptFunction->Scope()->InternalName();
45
46    if (scope->IsGlobalScope()) {
47        pg->DefineFunction(decl->Node(), scriptFunction, internalName);
48        pg->StoreGlobalVar(decl->Node(), var->Declaration()->Name());
49        return;
50    }
51
52    ASSERT(scope->IsFunctionScope() || scope->IsCatchScope() || scope->IsLocalScope() || scope->IsModuleScope());
53    varbinder::ConstScopeFindResult result(decl->Name(), scope, 0, var);
54
55    pg->DefineFunction(decl->Node(), scriptFunction, internalName);
56    pg->StoreAccToLexEnv(decl->Node(), result, true);
57}
58
59void Hoisting::Hoist(PandaGen *pg)
60{
61    const auto *scope = pg->Scope();
62
63    for (const auto &[_, var] : scope->Bindings()) {
64        (void)_;
65        if (!var->HasFlag(varbinder::VariableFlags::HOIST)) {
66            continue;
67        }
68
69        const auto *decl = var->Declaration();
70
71        if (decl->IsVarDecl()) {
72            HoistVar(pg, var, decl->AsVarDecl());
73        } else {
74            ASSERT(decl->IsFunctionDecl());
75            HoistFunction(pg, var, decl->AsFunctionDecl());
76        }
77    }
78}
79}  // namespace ark::es2panda::compiler
80